Table 1

Characteristics of lung cancer cases and controls

CasesControlsPa
No.(%)No.(%)
All of the subjects550(100.0)554(100.0)
Age (yr)0.100
 <55140(25.5)173(31.2)
 55–64185(33.6)176(31.8)
 ≥65225(40.9)205(37.0)
Sex0.093
 Male283(51.5)313(56.5)
 Female267(48.5)241(43.5)
Smoking statusb0.163
 Nonsmoker54(10.5)48(9.5)
 Former smoker235(45.6)260(51.5)
 Current smoker226(43.9)196(39.0)
Alcohol statusb0.001
 Nondrinker197(39.7)129(25.3)
 Former drinker148(29.8)153(30.1)
 Current drinker151(30.5)227(44.6)
Folate supplementb0.712
 Yes271(54.6)284(55.8)
 No225(45.4)225(44.2)
Continuous variablesc
 Age (yr)62.1 ± 9.5(34–87)60.4 ± 10.4(19–89)0.005
 Pack-yr51 ± 36(0–192)45 ± 33(0–189)0.004
 Alcohol (g/day)8.8 ± 18.6(0–128)9.2 ± 16.8(0–157)0.721
 Calories (kcal/day)2047 ± 705(597–5443)2020 ± 690(570–4553)0.534
 Folate (μg/day)317 ± 127(103–973)331 ± 137(92–1233)0.121
 Folate (μg/day/1000 kcal)162 ± 62(43–489)172 ± 69(65–805)0.033
  • a Two-sided χ2 test or t test.

  • b Information on smoking status was available for 515 cases and 504 controls, and information on alcohol and folate intake was available for 496 cases and 509 controls.

  • c Mean ± SD (range).